Evaluation of Filler Metals for High-Strength Stainless Steels

Conference · Tue Apr 02 04:00:00 EST 1991

OSTI ID:6076610

Swindeman, R. W. ^[1]; Goodwin, G. M. ^[1]; King, J. F. ^[1]; Lundin, C. D. ^[2]; Qiao, C. Y. P. ^[2]

---

1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
2. Univ. of Tennessee, Knoxville, TN (United States)

Weldments were produced in types 316, 17-14CuMo, and high strength 14Cr-16Ni-2Mo stainless steel base metals with four filler metals-alloy 82, 17-14CuMo stainless steel, controlled residual element CRE 16-8-2 stainless steel, and alloy 556. The welds were evaluated on the basis of microstructure, strength, and ductility. All of the base metals were prone to hot cracking, but steels high in phosphorus were the most likely to produce poor welds. The CRE 16-8-2 stainless steel filler metal produced the best combination of creep strength and ductility, while alloy 556 produced the best long-time creep strength. Tensile and creep failures usually occurred in the alloy 82, 17-14CuMo stainless steel, or CRE 16-8-2 stainless steel filler metal of weldments tested transverse to the weld. At low temperatures (600 to 700°C) and short times the alloy 556 filler metal usually failed, while at high temperature (700 to 800°C) and long times, the weldment usually failed in the base metal. In weldments creep tested parallel to the welding direction cracking initiated in the CRE 16-8-2 stainless steel filler, even though cracks were observed in the heat-affected zone of the base metal. The mechanical performance of weldments in 14Cr-16Ni-2Mo stainless steel tubing alloys was satisfactory in spite of the observed tendency for cracking. However, it was concluded that further development of the welding technology would be needed before the high-strength alloys would be commercially acceptable.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Fossil Energy and Carbon Management (FECM)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6076610
• Report Number(s): CONF-9104174--1; ON: DE91009931
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
COPPER ALLOYS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DUCTILITY
EVALUATION
FILLER METALS
HEAT RESIS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
STAINLESS STEEL-316
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
TENSILE PROPERTIES
WELDED JOINTS